Buggy code:
static final int EXIT_ABNORMAL = 4 ; private Option [ ] recognizedOptions = RecognizedOptions . getJavaCompilerOptions ( new OptionHelper ( ) { public void setOut ( PrintWriter out ) { } public void error ( String key , Object ... args ) { } public void printVersion ( ) { } public void printFullVersion ( ) { } public void printHelp ( ) { } public void printJhelp ( ) { } public void printXhelp ( ) { } public void addFile ( File f ) { } public void addClassName ( String s ) { } } ) ; public Main ( String name ) { } public Main ( String name , PrintWriter out ) { } private Options options = null ; public ListBuffer < File > filenames = null ; public ListBuffer < String > classnames = null ; void help ( ) { } void jhelp ( ) { } void xhelp ( ) { } void error ( String key , Object ... args ) { } void warning ( String key , Object ... args ) { } public Option getOption ( String flag ) { } public void setOptions ( Options options ) { } public void setFatalErrors ( boolean fatalErrors ) { } public List < File > processArgs ( String [ ] flags ) { } private boolean checkDirectory ( String optName ) { } public int compile ( String [ ] args ) { } public int compile ( String [ ] args , Context context ) { } public int compile ( String [ ] args , Context context , List < JavaFileObject > fileObjects , Iterable < ? extends Processor > processors ) { if ( ( options ) == null ) options = Options . instance ( context ) ; filenames = new ListBuffer < File > ( ) ; classnames = new ListBuffer < String > ( ) ; JavaCompiler comp = null ; try { if ( ( ( args . length ) == 0 ) && ( fileObjects . isEmpty ( ) ) ) { help ( ) ; return Main . EXIT_CMDERR ; } List < File > filenames ; try { filenames = processArgs ( CommandLine . parse ( args ) ) ; if ( filenames == null ) { return Main . EXIT_CMDERR ; } else if ( ( ( filenames . isEmpty ( ) ) && ( fileObjects . isEmpty ( ) ) ) && ( classnames . isEmpty ( ) ) ) { if ( ( ( ( ( ( options . get ( "-help" ) ) != null ) || ( ( options . get ( "-jhelp" ) ) != null ) ) || ( ( options . get ( "-X" ) ) != null ) ) || ( ( options . get ( "-version" ) ) != null ) ) || ( ( options . get ( "-fullversion" ) ) != null ) ) return Main . EXIT_OK ; error ( "err.no.source.files" ) ; return Main . EXIT_CMDERR ; } } catch ( FileNotFoundException e ) { Log . printLines ( out , ( ( ( ownName ) + ":<seq2seq4repair_space>" ) + ( Main . getLocalizedString ( "err.file.not.found" , e . getMessage ( ) ) ) ) ) ; return Main . EXIT_SYSERR ; } boolean forceStdOut = ( options . get ( "stdout" ) ) != null ; if ( forceStdOut ) { out . flush ( ) ; out = new PrintWriter ( System . out , true ) ; } context . put ( outKey , out ) ; fileManager = context . get ( JavaFileManager . class ) ; comp = LanguageCompiler . instance ( context ) ; if ( comp == null ) return Main . EXIT_SYSERR ; if ( ! ( classnames . isEmpty ( ) ) ) filenames = addModuleSources ( filenames ) ; if ( ! ( filenames . isEmpty ( ) ) ) { comp = JavaCompiler . instance ( context ) ; List < JavaFileObject > otherFiles = List . nil ( ) ; JavacFileManager dfm = ( ( JavacFileManager ) ( fileManager ) ) ; for ( JavaFileObject fo : dfm . getJavaFileObjectsFromFiles ( filenames ) ) otherFiles = otherFiles . prepend ( fo ) ; for ( JavaFileObject fo : otherFiles ) fileObjects = fileObjects . prepend ( fo ) ; } <START_BUG> if ( filenames . isEmpty ( ) ) { <END_BUG> error ( "err.no.source.files" ) ; return Main . EXIT_CMDERR ; } comp . compile ( fileObjects , classnames . toList ( ) , processors ) ; if ( ( comp . errorCount ( ) ) != 0 ) return Main . EXIT_ERROR ; } catch ( IOException ex ) { ioMessage ( ex ) ; return Main . EXIT_SYSERR ; } catch ( OutOfMemoryError ex ) { resourceMessage ( ex ) ; return Main . EXIT_SYSERR ; } catch ( StackOverflowError ex ) { resourceMessage ( ex ) ; return Main . EXIT_SYSERR ; } catch ( FatalError ex ) { feMessage ( ex ) ; return Main . EXIT_SYSERR ; } catch ( AnnotationProcessingError ex ) { apMessage ( ex ) ; return Main . EXIT_SYSERR ; } catch ( ClientCodeException ex ) { throw new RuntimeException ( ex . getCause ( ) ) ; } catch ( PropagatedException ex ) { throw ex . getCause ( ) ; } catch ( Throwable ex ) { if ( ( ( ( comp == null ) || ( ( comp . errorCount ( ) ) == 0 ) ) || ( ( options ) == null ) ) || ( ( options . get ( "dev" ) ) != null ) ) bugMessage ( ex ) ; return Main . EXIT_ABNORMAL ; } finally { if ( comp != null ) comp . close ( ) ; filenames = null ; options = null ; }

Fix:
if ( fileObjects . isEmpty ( ) ) {